Add backend

backend/migrations/00000000000000_diesel_initial_setup/down.sql

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+-- This file was automatically created by Diesel to setup helper functions
+-- and other internal bookkeeping. This file is safe to edit, any future
+-- changes will be added to existing projects as new migrations.
+
+DROP FUNCTION IF EXISTS diesel_manage_updated_at(_tbl regclass);
+DROP FUNCTION IF EXISTS diesel_set_updated_at();

backend/migrations/00000000000000_diesel_initial_setup/up.sql

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+-- This file was automatically created by Diesel to setup helper functions
+-- and other internal bookkeeping. This file is safe to edit, any future
+-- changes will be added to existing projects as new migrations.
+
+
+
+
+-- Sets up a trigger for the given table to automatically set a column called
+-- `updated_at` whenever the row is modified (unless `updated_at` was included
+-- in the modified columns)
+--
+-- # Example
+--
+-- ```sql
+-- CREATE TABLE users (id SERIAL PRIMARY KEY, updated_at TIMESTAMP NOT NULL DEFAULT NOW());
+--
+-- SELECT diesel_manage_updated_at('users');
+-- ```
+CREATE OR REPLACE FUNCTION diesel_manage_updated_at(_tbl regclass) RETURNS VOID AS $$
+BEGIN
+    EXECUTE format('CREATE TRIGGER set_updated_at BEFORE UPDATE ON %s
+                    FOR EACH ROW EXECUTE PROCEDURE diesel_set_updated_at()', _tbl);
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE OR REPLACE FUNCTION diesel_set_updated_at() RETURNS trigger AS $$
+BEGIN
+    IF (
+        NEW IS DISTINCT FROM OLD AND
+        NEW.updated_at IS NOT DISTINCT FROM OLD.updated_at
+    ) THEN
+        NEW.updated_at := current_timestamp;
+    END IF;
+    RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;

backend/migrations/2023-09-21-174215_add_song_table/down.sql

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+DROP TABLE song;
+

backend/migrations/2023-09-21-174215_add_song_table/up.sql

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+CREATE TABLE song(
+    song_hash TEXT NOT NULL PRIMARY KEY,
+    title TEXT NOT NULL,
+    artist TEXT NOT NULL,
+    cover TEXT,
+    language TEXT,
+    video TEXT,
+    year TEXT,
+    genre TEXT,
+    bpm TEXT NOT NULL,
+    duet_singer_1 TEXT,
+    duet_singer_2 TEXT
+);

backend/migrations/2023-09-21-202738_add_custom_lists/down.sql

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+DROP TABLE custom_list_entry;
+DROP TABLE custom_list;

backend/migrations/2023-09-21-202738_add_custom_lists/up.sql

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+CREATE TABLE custom_list (
+	id SERIAL PRIMARY KEY,
+	name TEXT UNIQUE NOT NULL
+);
+
+CREATE TABLE custom_list_entry (
+	list_id SERIAL REFERENCES custom_list(id),
+	song_hash TEXT NOT NULL REFERENCES song(song_hash),
+	PRIMARY KEY (list_id, song_hash)
+);